#include <Arduino.h>

#include "coin.h"
#include "hardware.h"

#include "esp32-hal-timer.h"
#include "freertos/FreeRTOS.h"
#include "freertos/xtensa_api.h"
#include "freertos/task.h"
#include "rom/ets_sys.h"
#include "soc/timer_group_struct.h"
#include "soc/dport_reg.h"
#include "esp_attr.h"
#include "esp_intr.h"

using namespace std;

portMUX_TYPE mux = portMUX_INITIALIZER_UNLOCKED;

static volatile int pulseCounter;
static unsigned long lastUpdate = 0;

static void IRAM_ATTR handleInterrupt() {
  portENTER_CRITICAL_ISR(&mux);
  pulseCounter++;
  lastUpdate = millis();
  portEXIT_CRITICAL_ISR(&mux);
}

Coin::Coin(void) {
  pulseCounter = 0;
}

void Coin::setup(void) {

  pinMode(COIN_PULSE_PIN, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(COIN_PULSE_PIN), handleInterrupt, FALLING);

}

int Coin::getMoney() {
  if (millis() - lastUpdate <= 200) delay(200);  // make sure to wait for the last pulse
  return pulseCounter*5;
}

void Coin::setZero() {
  pulseCounter=0;
}

void Coin::subtractMoney(int amount) {
  pulseCounter -= amount/5;
}